/src/systemd/src/libsystemd-network/sd-ipv4ll.c

Source
/* SPDX-License-Identifier: LGPL-2.1-or-later */
/***
  Copyright © 2014 Axis Communications AB. All rights reserved.
***/

#include "sd-id128.h"
#include "sd-ipv4acd.h"
#include "sd-ipv4ll.h"

#include "alloc-util.h"
#include "ether-addr-util.h"
#include "in-addr-util.h"
#include "network-common.h"
#include "siphash24.h"
#include "sparse-endian.h"

#define IPV4LL_NETWORK UINT32_C(0xA9FE0000)
#define IPV4LL_NETMASK UINT32_C(0xFFFF0000)

#define IPV4LL_DONT_DESTROY(ll) \
        _cleanup_(sd_ipv4ll_unrefp) _unused_ sd_ipv4ll *_dont_destroy_##ll = sd_ipv4ll_ref(ll)

struct sd_ipv4ll {
        unsigned n_ref;

        sd_ipv4acd *acd;

        be32_t address; /* the address pushed to ACD */
        struct ether_addr mac;

        struct {
                le64_t value;
                le64_t generation;
        } seed;
        bool seed_set;

        /* External */
        be32_t claimed_address;

        sd_ipv4ll_callback_t callback;
        void *userdata;

        sd_ipv4ll_check_mac_callback_t check_mac_callback;
        void *check_mac_userdata;
};

#define log_ipv4ll_errno(ll, error, fmt, ...)           \
        log_interface_prefix_full_errno(                \
                "IPv4LL: ",                             \
                sd_ipv4ll, ll,                          \
                error, fmt, ##__VA_ARGS__)
#define log_ipv4ll(ll, fmt, ...)                        \
        log_interface_prefix_full_errno_zerook(         \
                "IPv4LL: ",                             \
                sd_ipv4ll, ll,                          \
                0, fmt, ##__VA_ARGS__)

static void ipv4ll_on_acd(sd_ipv4acd *acd, int event, void *userdata);
static int ipv4ll_check_mac(sd_ipv4acd *acd, const struct ether_addr *mac, void *userdata);

static sd_ipv4ll *ipv4ll_free(sd_ipv4ll *ll) {
        assert(ll);

        sd_ipv4acd_unref(ll->acd);
        return mfree(ll);
}

DEFINE_TRIVIAL_REF_UNREF_FUNC(sd_ipv4ll, sd_ipv4ll, ipv4ll_free);

int sd_ipv4ll_new(sd_ipv4ll **ret) {
        _cleanup_(sd_ipv4ll_unrefp) sd_ipv4ll *ll = NULL;
        int r;

        assert_return(ret, -EINVAL);

        ll = new0(sd_ipv4ll, 1);
        if (!ll)
                return -ENOMEM;

        ll->n_ref = 1;

        r = sd_ipv4acd_new(&ll->acd);
        if (r < 0)
                return r;

        r = sd_ipv4acd_set_callback(ll->acd, ipv4ll_on_acd, ll);
        if (r < 0)
                return r;

        r = sd_ipv4acd_set_check_mac_callback(ll->acd, ipv4ll_check_mac, ll);
        if (r < 0)
                return r;

        *ret = TAKE_PTR(ll);

        return 0;
}

int sd_ipv4ll_stop(sd_ipv4ll *ll) {
        if (!ll)
                return 0;

        return sd_ipv4acd_stop(ll->acd);
}

int sd_ipv4ll_set_ifindex(sd_ipv4ll *ll, int ifindex) {
        assert_return(ll, -EINVAL);
        assert_return(ifindex > 0, -EINVAL);
        assert_return(sd_ipv4ll_is_running(ll) == 0, -EBUSY);

        return sd_ipv4acd_set_ifindex(ll->acd, ifindex);
}

int sd_ipv4ll_get_ifindex(sd_ipv4ll *ll) {
        if (!ll)
                return -EINVAL;

        return sd_ipv4acd_get_ifindex(ll->acd);
}

int sd_ipv4ll_set_ifname(sd_ipv4ll *ll, const char *ifname) {
        assert_return(ll, -EINVAL);
        assert_return(ifname, -EINVAL);

        return sd_ipv4acd_set_ifname(ll->acd, ifname);
}

int sd_ipv4ll_get_ifname(sd_ipv4ll *ll, const char **ret) {
        assert_return(ll, -EINVAL);

        return sd_ipv4acd_get_ifname(ll->acd, ret);
}

int sd_ipv4ll_set_mac(sd_ipv4ll *ll, const struct ether_addr *addr) {
        int r;

        assert_return(ll, -EINVAL);
        assert_return(addr, -EINVAL);
        assert_return(!ether_addr_is_null(addr), -EINVAL);

        r = sd_ipv4acd_set_mac(ll->acd, addr);
        if (r < 0)
                return r;

        ll->mac = *addr;
        return 0;
}

int sd_ipv4ll_set_timeout(sd_ipv4ll *ll, uint64_t usec) {
        assert_return(ll, -EINVAL);

        return sd_ipv4acd_set_timeout(ll->acd, usec);
}

int sd_ipv4ll_detach_event(sd_ipv4ll *ll) {
        assert_return(ll, -EINVAL);

        return sd_ipv4acd_detach_event(ll->acd);
}

int sd_ipv4ll_attach_event(sd_ipv4ll *ll, sd_event *event, int64_t priority) {
        assert_return(ll, -EINVAL);

        return sd_ipv4acd_attach_event(ll->acd, event, priority);
}

int sd_ipv4ll_set_callback(sd_ipv4ll *ll, sd_ipv4ll_callback_t cb, void *userdata) {
        assert_return(ll, -EINVAL);

        ll->callback = cb;
        ll->userdata = userdata;

        return 0;
}

int sd_ipv4ll_set_check_mac_callback(sd_ipv4ll *ll, sd_ipv4ll_check_mac_callback_t cb, void *userdata) {
        assert_return(ll, -EINVAL);

        ll->check_mac_callback = cb;
        ll->check_mac_userdata = userdata;

        return 0;
}

int sd_ipv4ll_get_address(sd_ipv4ll *ll, struct in_addr *address) {
        assert_return(ll, -EINVAL);
        assert_return(address, -EINVAL);

        if (ll->claimed_address == 0)
                return -ENOENT;

        address->s_addr = ll->claimed_address;

        return 0;
}

int sd_ipv4ll_set_address_seed(sd_ipv4ll *ll, uint64_t seed) {
        assert_return(ll, -EINVAL);
        assert_return(sd_ipv4ll_is_running(ll) == 0, -EBUSY);

        ll->seed.value = htole64(seed);
        ll->seed_set = true;

        return 0;
}

int sd_ipv4ll_is_running(sd_ipv4ll *ll) {
        if (!ll)
                return false;

        return sd_ipv4acd_is_running(ll->acd);
}

int sd_ipv4ll_set_address(sd_ipv4ll *ll, const struct in_addr *address) {
        int r;

        assert_return(ll, -EINVAL);
        assert_return(address, -EINVAL);
        assert_return(in4_addr_is_link_local_dynamic(address), -EINVAL);

        r = sd_ipv4acd_set_address(ll->acd, address);
        if (r < 0)
                return r;

        ll->address = address->s_addr;

        return 0;
}

#define PICK_HASH_KEY SD_ID128_MAKE(15,ac,82,a6,d6,3f,49,78,98,77,5d,0c,69,02,94,0b)

static int ipv4ll_pick_address(sd_ipv4ll *ll) {
        be32_t addr;

        assert(ll);

        do {
                uint64_t h;

                h = siphash24(&ll->seed, sizeof(ll->seed), PICK_HASH_KEY.bytes);

                /* Increase the generation counter by one */
                ll->seed.generation = htole64(le64toh(ll->seed.generation) + 1);

                addr = htobe32((h & UINT32_C(0x0000FFFF)) | IPV4LL_NETWORK);
        } while (addr == ll->address ||
                 IN_SET(be32toh(addr) & 0x0000FF00U, 0x0000U, 0xFF00U));

        log_ipv4ll(ll, "Picked new IP address %s.", IN4_ADDR_TO_STRING((const struct in_addr*) &addr));

        return sd_ipv4ll_set_address(ll, &(struct in_addr) { addr });
}

#define MAC_HASH_KEY SD_ID128_MAKE(df,04,22,98,3f,ad,14,52,f9,87,2e,d1,9c,70,e2,f2)

static int ipv4ll_start_internal(sd_ipv4ll *ll, bool reset_generation) {
        int r;
        bool picked_address = false;

        assert_return(ll, -EINVAL);
        assert_return(!ether_addr_is_null(&ll->mac), -EINVAL);

        /* If no random seed is set, generate some from the MAC address */
        if (!ll->seed_set)
                ll->seed.value = htole64(siphash24(ll->mac.ether_addr_octet, ETH_ALEN, MAC_HASH_KEY.bytes));

        if (reset_generation)
                ll->seed.generation = 0;

        if (ll->address == 0) {
                r = ipv4ll_pick_address(ll);
                if (r < 0)
                        return r;

                picked_address = true;
        }

        r = sd_ipv4acd_start(ll->acd, reset_generation);
        if (r < 0) {

                /* We couldn't start? If so, let's forget the picked address again, the user might make a change and
                 * retry, and we want the new data to take effect when picking an address. */
                if (picked_address)
                        ll->address = 0;

                return r;
        }

        return 1;
}

int sd_ipv4ll_start(sd_ipv4ll *ll) {
        assert_return(ll, -EINVAL);

        if (sd_ipv4ll_is_running(ll))
                return 0;

        return ipv4ll_start_internal(ll, true);
}

int sd_ipv4ll_restart(sd_ipv4ll *ll) {
        ll->address = 0;

        return ipv4ll_start_internal(ll, false);
}

static void ipv4ll_client_notify(sd_ipv4ll *ll, int event) {
        assert(ll);

        if (ll->callback)
                ll->callback(ll, event, ll->userdata);
}

void ipv4ll_on_acd(sd_ipv4acd *acd, int event, void *userdata) {
        sd_ipv4ll *ll = ASSERT_PTR(userdata);
        IPV4LL_DONT_DESTROY(ll);
        int r;

        assert(acd);

        switch (event) {

        case SD_IPV4ACD_EVENT_STOP:
                ipv4ll_client_notify(ll, SD_IPV4LL_EVENT_STOP);
                ll->claimed_address = 0;
                break;

        case SD_IPV4ACD_EVENT_BIND:
                ll->claimed_address = ll->address;
                ipv4ll_client_notify(ll, SD_IPV4LL_EVENT_BIND);
                break;

        case SD_IPV4ACD_EVENT_CONFLICT:
                /* if an address was already bound we must call up to the
                   user to handle this, otherwise we just try again */
                if (ll->claimed_address != 0) {
                        ipv4ll_client_notify(ll, SD_IPV4LL_EVENT_CONFLICT);

                        ll->claimed_address = 0;
                } else {
                        r = sd_ipv4ll_restart(ll);
                        if (r < 0)
                                goto error;
                }

                break;

        default:
                assert_not_reached();
        }

        return;

error:
        ipv4ll_client_notify(ll, SD_IPV4LL_EVENT_STOP);
}

static int ipv4ll_check_mac(sd_ipv4acd *acd, const struct ether_addr *mac, void *userdata) {
        sd_ipv4ll *ll = ASSERT_PTR(userdata);

        if (ll->check_mac_callback)
                return ll->check_mac_callback(ll, mac, ll->check_mac_userdata);

        return 0;
}

Coverage Report

Created: 2026-01-25 06:28

Line	Count	Source
1		/* SPDX-License-Identifier: LGPL-2.1-or-later */
2		/***
3		Copyright © 2014 Axis Communications AB. All rights reserved.
4		***/
5
6		#include "sd-id128.h"
7		#include "sd-ipv4acd.h"
8		#include "sd-ipv4ll.h"
9
10		#include "alloc-util.h"
11		#include "ether-addr-util.h"
12		#include "in-addr-util.h"
13		#include "network-common.h"
14		#include "siphash24.h"
15		#include "sparse-endian.h"
16
17	0	#define IPV4LL_NETWORK UINT32_C(0xA9FE0000)
18		#define IPV4LL_NETMASK UINT32_C(0xFFFF0000)
19
20		#define IPV4LL_DONT_DESTROY(ll) \
21	0	_cleanup_(sd_ipv4ll_unrefp) _unused_ sd_ipv4ll *_dont_destroy_##ll = sd_ipv4ll_ref(ll)
22
23		struct sd_ipv4ll {
24		unsigned n_ref;
25
26		sd_ipv4acd *acd;
27
28		be32_t address; /* the address pushed to ACD */
29		struct ether_addr mac;
30
31		struct {
32		le64_t value;
33		le64_t generation;
34		} seed;
35		bool seed_set;
36
37		/* External */
38		be32_t claimed_address;
39
40		sd_ipv4ll_callback_t callback;
41		void *userdata;
42
43		sd_ipv4ll_check_mac_callback_t check_mac_callback;
44		void *check_mac_userdata;
45		};
46
47		#define log_ipv4ll_errno(ll, error, fmt, ...) \
48		log_interface_prefix_full_errno( \
49		"IPv4LL: ", \
50		sd_ipv4ll, ll, \
51		error, fmt, ##__VA_ARGS__)
52		#define log_ipv4ll(ll, fmt, ...) \
53	0	log_interface_prefix_full_errno_zerook( \
54	0	"IPv4LL: ", \
55	0	sd_ipv4ll, ll, \
56	0	0, fmt, ##__VA_ARGS__)
57
58		static void ipv4ll_on_acd(sd_ipv4acd acd, int event, void userdata);
59		static int ipv4ll_check_mac(sd_ipv4acd acd, const struct ether_addr mac, void *userdata);
60
61	0	static sd_ipv4ll ipv4ll_free(sd_ipv4ll ll) {
62	0	assert(ll);
63
64	0	sd_ipv4acd_unref(ll->acd);
65	0	return mfree(ll);
66	0	}
67
68	0	DEFINE_TRIVIAL_REF_UNREF_FUNC(sd_ipv4ll, sd_ipv4ll, ipv4ll_free); Unexecuted instantiation: sd_ipv4ll_ref Unexecuted instantiation: sd_ipv4ll_unref
69	0
70	0	int sd_ipv4ll_new(sd_ipv4ll **ret) {
71	0	_cleanup_(sd_ipv4ll_unrefp) sd_ipv4ll *ll = NULL;
72	0	int r;
73
74	0	assert_return(ret, -EINVAL);
75
76	0	ll = new0(sd_ipv4ll, 1);
77	0	if (!ll)
78	0	return -ENOMEM;
79
80	0	ll->n_ref = 1;
81
82	0	r = sd_ipv4acd_new(&ll->acd);
83	0	if (r < 0)
84	0	return r;
85
86	0	r = sd_ipv4acd_set_callback(ll->acd, ipv4ll_on_acd, ll);
87	0	if (r < 0)
88	0	return r;
89
90	0	r = sd_ipv4acd_set_check_mac_callback(ll->acd, ipv4ll_check_mac, ll);
91	0	if (r < 0)
92	0	return r;
93
94	0	*ret = TAKE_PTR(ll);
95
96	0	return 0;
97	0	}
98
99	0	int sd_ipv4ll_stop(sd_ipv4ll *ll) {
100	0	if (!ll)
101	0	return 0;
102
103	0	return sd_ipv4acd_stop(ll->acd);
104	0	}
105
106	0	int sd_ipv4ll_set_ifindex(sd_ipv4ll *ll, int ifindex) {
107	0	assert_return(ll, -EINVAL);
108	0	assert_return(ifindex > 0, -EINVAL);
109	0	assert_return(sd_ipv4ll_is_running(ll) == 0, -EBUSY);
110
111	0	return sd_ipv4acd_set_ifindex(ll->acd, ifindex);
112	0	}
113
114	0	int sd_ipv4ll_get_ifindex(sd_ipv4ll *ll) {
115	0	if (!ll)
116	0	return -EINVAL;
117
118	0	return sd_ipv4acd_get_ifindex(ll->acd);
119	0	}
120
121	0	int sd_ipv4ll_set_ifname(sd_ipv4ll ll, const char ifname) {
122	0	assert_return(ll, -EINVAL);
123	0	assert_return(ifname, -EINVAL);
124
125	0	return sd_ipv4acd_set_ifname(ll->acd, ifname);
126	0	}
127
128	0	int sd_ipv4ll_get_ifname(sd_ipv4ll ll, const char *ret) {
129	0	assert_return(ll, -EINVAL);
130
131	0	return sd_ipv4acd_get_ifname(ll->acd, ret);
132	0	}
133
134	0	int sd_ipv4ll_set_mac(sd_ipv4ll ll, const struct ether_addr addr) {
135	0	int r;
136
137	0	assert_return(ll, -EINVAL);
138	0	assert_return(addr, -EINVAL);
139	0	assert_return(!ether_addr_is_null(addr), -EINVAL);
140
141	0	r = sd_ipv4acd_set_mac(ll->acd, addr);
142	0	if (r < 0)
143	0	return r;
144
145	0	ll->mac = *addr;
146	0	return 0;
147	0	}
148
149	0	int sd_ipv4ll_set_timeout(sd_ipv4ll *ll, uint64_t usec) {
150	0	assert_return(ll, -EINVAL);
151
152	0	return sd_ipv4acd_set_timeout(ll->acd, usec);
153	0	}
154
155	0	int sd_ipv4ll_detach_event(sd_ipv4ll *ll) {
156	0	assert_return(ll, -EINVAL);
157
158	0	return sd_ipv4acd_detach_event(ll->acd);
159	0	}
160
161	0	int sd_ipv4ll_attach_event(sd_ipv4ll ll, sd_event event, int64_t priority) {
162	0	assert_return(ll, -EINVAL);
163
164	0	return sd_ipv4acd_attach_event(ll->acd, event, priority);
165	0	}
166
167	0	int sd_ipv4ll_set_callback(sd_ipv4ll ll, sd_ipv4ll_callback_t cb, void userdata) {
168	0	assert_return(ll, -EINVAL);
169
170	0	ll->callback = cb;
171	0	ll->userdata = userdata;
172
173	0	return 0;
174	0	}
175
176	0	int sd_ipv4ll_set_check_mac_callback(sd_ipv4ll ll, sd_ipv4ll_check_mac_callback_t cb, void userdata) {
177	0	assert_return(ll, -EINVAL);
178
179	0	ll->check_mac_callback = cb;
180	0	ll->check_mac_userdata = userdata;
181
182	0	return 0;
183	0	}
184
185	0	int sd_ipv4ll_get_address(sd_ipv4ll ll, struct in_addr address) {
186	0	assert_return(ll, -EINVAL);
187	0	assert_return(address, -EINVAL);
188
189	0	if (ll->claimed_address == 0)
190	0	return -ENOENT;
191
192	0	address->s_addr = ll->claimed_address;
193
194	0	return 0;
195	0	}
196
197	0	int sd_ipv4ll_set_address_seed(sd_ipv4ll *ll, uint64_t seed) {
198	0	assert_return(ll, -EINVAL);
199	0	assert_return(sd_ipv4ll_is_running(ll) == 0, -EBUSY);
200
201	0	ll->seed.value = htole64(seed);
202	0	ll->seed_set = true;
203
204	0	return 0;
205	0	}
206
207	0	int sd_ipv4ll_is_running(sd_ipv4ll *ll) {
208	0	if (!ll)
209	0	return false;
210
211	0	return sd_ipv4acd_is_running(ll->acd);
212	0	}
213
214	0	int sd_ipv4ll_set_address(sd_ipv4ll ll, const struct in_addr address) {
215	0	int r;
216
217	0	assert_return(ll, -EINVAL);
218	0	assert_return(address, -EINVAL);
219	0	assert_return(in4_addr_is_link_local_dynamic(address), -EINVAL);
220
221	0	r = sd_ipv4acd_set_address(ll->acd, address);
222	0	if (r < 0)
223	0	return r;
224
225	0	ll->address = address->s_addr;
226
227	0	return 0;
228	0	}
229
230	0	#define PICK_HASH_KEY SD_ID128_MAKE(15,ac,82,a6,d6,3f,49,78,98,77,5d,0c,69,02,94,0b)
231
232	0	static int ipv4ll_pick_address(sd_ipv4ll *ll) {
233	0	be32_t addr;
234
235	0	assert(ll);
236
237	0	do {
238	0	uint64_t h;
239
240	0	h = siphash24(&ll->seed, sizeof(ll->seed), PICK_HASH_KEY.bytes);
241
242		/* Increase the generation counter by one */
243	0	ll->seed.generation = htole64(le64toh(ll->seed.generation) + 1);
244
245	0	addr = htobe32((h & UINT32_C(0x0000FFFF)) \| IPV4LL_NETWORK);
246	0	} while (addr == ll->address \|\|
247	0	IN_SET(be32toh(addr) & 0x0000FF00U, 0x0000U, 0xFF00U));
248
249	0	log_ipv4ll(ll, "Picked new IP address %s.", IN4_ADDR_TO_STRING((const struct in_addr*) &addr));
250
251	0	return sd_ipv4ll_set_address(ll, &(struct in_addr) { addr });
252	0	}
253
254	0	#define MAC_HASH_KEY SD_ID128_MAKE(df,04,22,98,3f,ad,14,52,f9,87,2e,d1,9c,70,e2,f2)
255
256	0	static int ipv4ll_start_internal(sd_ipv4ll *ll, bool reset_generation) {
257	0	int r;
258	0	bool picked_address = false;
259
260	0	assert_return(ll, -EINVAL);
261	0	assert_return(!ether_addr_is_null(&ll->mac), -EINVAL);
262
263		/* If no random seed is set, generate some from the MAC address */
264	0	if (!ll->seed_set)
265	0	ll->seed.value = htole64(siphash24(ll->mac.ether_addr_octet, ETH_ALEN, MAC_HASH_KEY.bytes));
266
267	0	if (reset_generation)
268	0	ll->seed.generation = 0;
269
270	0	if (ll->address == 0) {
271	0	r = ipv4ll_pick_address(ll);
272	0	if (r < 0)
273	0	return r;
274
275	0	picked_address = true;
276	0	}
277
278	0	r = sd_ipv4acd_start(ll->acd, reset_generation);
279	0	if (r < 0) {
280
281		/* We couldn't start? If so, let's forget the picked address again, the user might make a change and
282		* retry, and we want the new data to take effect when picking an address. */
283	0	if (picked_address)
284	0	ll->address = 0;
285
286	0	return r;
287	0	}
288
289	0	return 1;
290	0	}
291
292	0	int sd_ipv4ll_start(sd_ipv4ll *ll) {
293	0	assert_return(ll, -EINVAL);
294
295	0	if (sd_ipv4ll_is_running(ll))
296	0	return 0;
297
298	0	return ipv4ll_start_internal(ll, true);
299	0	}
300
301	0	int sd_ipv4ll_restart(sd_ipv4ll *ll) {
302	0	ll->address = 0;
303
304	0	return ipv4ll_start_internal(ll, false);
305	0	}
306
307	0	static void ipv4ll_client_notify(sd_ipv4ll *ll, int event) {
308	0	assert(ll);
309
310	0	if (ll->callback)
311	0	ll->callback(ll, event, ll->userdata);
312	0	}
313
314	0	void ipv4ll_on_acd(sd_ipv4acd acd, int event, void userdata) {
315	0	sd_ipv4ll *ll = ASSERT_PTR(userdata);
316	0	IPV4LL_DONT_DESTROY(ll);
317	0	int r;
318
319	0	assert(acd);
320
321	0	switch (event) {
322
323	0	case SD_IPV4ACD_EVENT_STOP:
324	0	ipv4ll_client_notify(ll, SD_IPV4LL_EVENT_STOP);
325	0	ll->claimed_address = 0;
326	0	break;
327
328	0	case SD_IPV4ACD_EVENT_BIND:
329	0	ll->claimed_address = ll->address;
330	0	ipv4ll_client_notify(ll, SD_IPV4LL_EVENT_BIND);
331	0	break;
332
333	0	case SD_IPV4ACD_EVENT_CONFLICT:
334		/* if an address was already bound we must call up to the
335		user to handle this, otherwise we just try again */
336	0	if (ll->claimed_address != 0) {
337	0	ipv4ll_client_notify(ll, SD_IPV4LL_EVENT_CONFLICT);
338
339	0	ll->claimed_address = 0;
340	0	} else {
341	0	r = sd_ipv4ll_restart(ll);
342	0	if (r < 0)
343	0	goto error;
344	0	}
345
346	0	break;
347
348	0	default:
349	0	assert_not_reached();
350	0	}
351
352	0	return;
353
354	0	error:
355	0	ipv4ll_client_notify(ll, SD_IPV4LL_EVENT_STOP);
356	0	}
357
358	0	static int ipv4ll_check_mac(sd_ipv4acd acd, const struct ether_addr mac, void *userdata) {
359	0	sd_ipv4ll *ll = ASSERT_PTR(userdata);
360
361	0	if (ll->check_mac_callback)
362	0	return ll->check_mac_callback(ll, mac, ll->check_mac_userdata);
363
364	0	return 0;
365	0	}